Blackley played a key role in Oakland's run to a surprising American League
West title last season, but failed to make the club's Opening Day roster and
was designated for assignment last week.

The native Australian went 6-4 with a 3.86 earned run average over 24 games,
including 15 starts, for the A's in 2012. In his final outing of the season,
Blackley held Texas to one run over six innings to lead Oakland to a 3-1 win
that moved the Athletics into a first-place with the Rangers in the AL West.

Goebbert, a 13th-round pick of Houston in the 2009 MLB Draft, spent last
season between Double-A Corpus Christi and Triple-A Oklahoma City and batted a
combined .291 with 54 RBI.